This is a Future icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 12,700 icons, all in the same style and quality.
The icon is shaped like a circle but one end located at the top right has an arrow. The other end doesn't fully touch the arrow point after wrapping fully around. Inside the circle are lines that resemble a clock showing 4 o'clock.